Fair Value (Details 1) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Ending balance	$ 8,505		$ 8,505
Equity Securities [Member]
Reconciliation of income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Ending balance	949		949
Fair value on a recurring basis [Member] | Equity Securities [Member]
Reconciliation of income statement classification of gains and losses for all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	992	1,160	1,072	1,147
Included in other comprehensive income (loss)	(43)	(18)	(123)	(5)
Ending balance	$ 949	$ 1,142	$ 949	$ 1,142